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    <div class="post-body" itemprop="articleBody"><p>本文主要是STM32开发——OLED屏幕显示基础知识的一些相关笔记，若笔记中有错误或者不合适的地方，欢迎批评指正😃。</p>
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center" width=150px>Windows</td>        <td align="left">windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu16.04的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 16 Pro</td>        <td align="left">16.2.3 build-19376536</td>      </tr>    <tr>        <td align="center">SecureCRT</td>        <td align="left">Version 8.7.2 (x64 build 2214)   -   正式版-2020年5月14日</td>      </tr>    <tr>        <td align="center">开发板</td>        <td align="left">正点原子 i.MX6ULL Linux阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，NXP提供的版本为uboot-imx-rel_imx_4.1.15_2.1.0_ga(使用的uboot版本为U-Boot 2016.03)</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.15(NXP官方提供)</td>      </tr>    <tr>        <td align="center">STM32开发板</td>        <td align="left">正点原子战舰V3(STM32F103ZET6)</td>      </tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <ul><li>通用</li></ul><table><tr><td align="center">分类  </td><td align="center">网址</td><td align="center">说明</td></tr><tr><td align="center" rowspan="4">官方网站</td><td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td><td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td></tr><tr>                                            <td align="left"><a href="https://www.st.com/content/st_com/zh.html" target="_blank">https://www.st.com/content/st_com/zh.html</a></td><td align="left">ST官方网站，在这里我们可以找到STM32的相关文档</td></tr><tr>                                            <td align="left"><a href="https://www.stmcu.com.cn/" target="_blank">https://www.stmcu.com.cn/</a></td><td align="left">意法半导体ST中文官方网站，在这里我们可以找到STM32的相关中文参考文档</td></tr><tr>                                            <td align="left"><a href="http://elm-chan.org/fsw/ff/00index_e.html" target="_blank">http://elm-chan.org/fsw/ff/00index_e.html</a></td><td align="left">FatFs文件系统官网</td></tr><tr><td align="center" rowspan="3">教程书籍</td><td align="left"><a href="STM32开发相关资料/01ARM参考资料/ARM Cortex-M3权威指南(中文).pdf" target="_blank">《ARM Cortex-M3权威指南》</a></td><td alirn="left" rowspan="3">ARM公司专家Joseph Yiu（姚文祥）的力作，中文翻译是NXP的宋岩</td></tr><tr>                                            <td align="left"><a href="STM32开发相关资料/01ARM参考资料/ARM Cortex-M0权威指南(中文).pdf" target="_blank">《ARM Cortex-M0权威指南》</a></td></tr><tr>                                            <td align="left"><a href="" target="_blank">《ARM Cortex-M3与Cortex-M4权威指南》</a></td></tr><tr><td align="center" rowspan="4">开发论坛</td><td align="left"><a href="http://47.111.11.73/forum.php" target="_blank">http://47.111.11.73/forum.php</a></td><td align="left">开源电子网，正点原子的资料下载及问题讨论论坛</td></tr><tr>                                            <td align="left"><a href="https://www.firebbs.cn/forum.php" target="_blank">https://www.firebbs.cn/forum.php</a></td><td align="left">国内Kinetis开发板-野火/秉火（刘火良）主持的论坛，现也做STM32和i.MX RT</td></tr><tr>                                            <td align="left"><a href="https://www.amobbs.com/index.php" target="_blank">https://www.amobbs.com/index.php</a></td><td align="left">阿莫（莫进明）主持的论坛，号称国内最早最火的电子论坛，以交流Atmel AVR系列单片机起家，现已拓展到嵌入式全平台，其STM32系列帖子有70W+。</td></tr><tr>                                            <td align="left"><a href="http://download.100ask.net/index.html" target="_blank">http://download.100ask.net/index.html</a></td><td align="left">韦东山嵌入式资料中心，有些STM32和linux的相关资料也可以来这里找。</td></tr><tr><td align="center" rowspan="3">博客参考</td><td align="left"><a href="http://www.openedv.com/" target="_blank">http://www.openedv.com/</a></td><td align="left">开源网-原子哥个人博客</td></tr><tr>                                            <td align="left"><a href="http://blog.chinaaet.com/jihceng0622" target="_blank">http://blog.chinaaet.com/jihceng0622</a></td><td align="left">博主是原Freescale现NXP的现场应用工程师</td></tr><tr>                                            <td align="left"><a href="https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/cortex-m-resources" target="_blank">cortex-m-resources</a></td><td align="left">这其实并不算是一个博客，这是ARM公司专家Joseph Yiu收集整理的所有对开发者有用的官方Cortex-M资料链接（也包含极少数外部资源链接）</td></tr></table><ul><li>STM32</li></ul><table>    <tr><td align="center" rowspan="2">STM32</td><td align="left"><a href="https://doc.embedfire.com/mcu/stm32/f103/hal_general/zh/latest/index.html" target="_blank">STM32 HAL库开发实战指南——基于F103系列开发板</a></td><td align="left">野火STM32开发教程在线文档</td></tr><tr>                                            <td align="left"><a href="https://doc.embedfire.com/mcu/stm32/f103badao/std/zh/latest/index.html" target="_blank">STM32库开发实战指南——基于野火霸道开发板</a></td><td align="left">野火STM32开发教程在线文档</td></tr></table><ul><li>SD卡</li></ul><table>    <tr><td align="left"><a href="https://www.sdcard.org/" target="_blank">SD Association</a></td><td align="left">提供了SD存储卡和SDIO卡系统规范</td></tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
              <div class='content'>
              <table>    <tr><td align="left"><a href="https://www.st.com/resource/en/datasheet/stm32f103ze.pdf" target="_blank">STM32F103xx英文数据手册</a></td><td align="left">STM32F103xC/D/E系列的英文数据手册</td></tr>    <tr><td align="left"><a href="https://www.stmcu.com.cn/Designresource/detail/localization_document%20/709978" target="_blank">STM32F103xx中文数据手册</a></td><td align="left">STM32F103xC/D/E系列的中文数据手册</td></tr>    <tr><td align="left"><a href="https://www.st.com/resource/en/reference_manual/rm0008-stm32f101xx-stm32f102xx-stm32f103xx-stm32f105xx-and-stm32f107xx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf" target="_blank">STM32F10xxx英文参考手册（RM0008）</a></td><td align="left">STM32F10xxx系列的英文参考手册</td></tr>    <tr><td align="left"><a href="https://www.stmcu.com.cn/Designresource/detail/localization_document%20/710001" target="_blank">STM32F10xxx中文参考手册（RM0008）</a></td><td align="left">STM32F10xxx系列的中文参考手册</td></tr>    <tr><td align="left"><a href="https://developer.arm.com/documentation/100165/0201/?lang=en" target="_blank">Arm Cortex-M3 处理器技术参考手册-英文版</a></td><td align="left">Cortex-M3技术参考手册-英文版</td></tr>    <tr><td align="left"><a href="https://www.st.com/resource/en/programming_manual/pm0056-stm32f10xxx20xxx21xxxl1xxxx-cortexm3-programming-manual-stmicroelectronics.pdf" target="_blank">STM32F10xxx Cortex-M3编程手册-英文版(PM0056)</a></td><td align="left">STM32F10xxx/20xxx/21xxx/L1xxxx系列Cortex-M3编程手册-英文版</td></tr>    <tr><td align="left"><a href="https://www.sdcard.org/downloads/pls/" target="_blank">SD卡相关资料——最新版本</a></td><td align="left">有关SD卡的一些资料可以从这里下载</td></tr>    <tr><td align="left"><a href="https://www.sdcard.org/downloads/pls/archives/" target="_blank">SD卡相关资料——历史版本</a></td><td align="left">有关SD卡的一些历史版本资料可以从这里下载，比如后边看的SD卡2.0协议</td></tr>    <tr><td align="left"><a href="./" target="_blank">SD 2.0 协议标准完整版</a></td><td align="left">这是一篇关于SD卡2.0协议的中文文档，还是比较有参考价值的，可以一看</td></tr></table>
              </div>
            </details> 

<p>本节笔记放在这里，主要是为了学习8080时序，为后边FSMC产生8080时序做铺垫，这一部分的笔记是用GPIO模拟8080时序，这样对8080时序的认识会更深刻一些。这一节会涉及一些像素啊，显存啊什么的基本概念，笔记写在LCD屏幕学的相关笔记中了。平时我用的还是I2C或者SPI接口的OLED。</p>
<h1 id="一、OLED简介"><a href="#一、OLED简介" class="headerlink" title="一、OLED简介"></a><font size=3>一、OLED简介</font></h1><h2 id="1-简介"><a href="#1-简介" class="headerlink" title="1. 简介"></a><font size=3>1. 简介</font></h2><p>OLED，即有机发光二极管（Organic Light-Emitting Diode），又称为有机电激光显示（Organic Electroluminesence Display， OELD）。OLED由于同时具备自发光，不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异之特性，被认为是下一代的平面显示器新兴应用技术。</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230503200912472.png" alt="image-20230503200912472" style="zoom:50%;" />

<p>OLED显示技术具有自发光的特性，采用非常薄的有机材料涂层和玻璃基板，当有电流通过时，这些有机材料就会发光，而且OLED显示屏幕可视角度大，并且能够节省电能，从2003年开始这种显示设备在MP3播放器上得到了应用。</p>
<p>LCD都需要背光，而OLED不需要，因为它是自发光的。这样同样的显示，OLED效果要来得好一些。以目前的技术，OLED的尺寸还难以大型化，但是分辨率确可以做到很高。</p>
<h2 id="2-0-96寸OLED特点"><a href="#2-0-96寸OLED特点" class="headerlink" title="2. 0.96寸OLED特点"></a><font size=3>2. 0.96寸OLED特点</font></h2><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516213810476.png" alt="image-20230516213810476" style="zoom:50%;" />

<p>我学习的是正点原子出的OLED模块ATK-MD0096（但是只是为了学习8080接口，平时我用的还是I2C或者SPI接口的OLED），它有以下特点：</p>
<p>（1）模块有单色和双色两种可选，单色为纯蓝色，而双色则为黄蓝双色。单色模块每个像素点只有亮与不亮两种情况，没有颜色区分。</p>
<p>（2）尺寸小，显示尺寸为0.96寸，而模块的尺寸仅为27mm*26mm大小。</p>
<p>（3）高分辨率，该模块的分辨率为128*64。</p>
<p>（4）多种接口方式，该模块提供了总共4种接口包括：6800、8080两种并行接口方式、 4线的穿行SPI接口方式，、I2C接口方式（只需要2根线就可以控制OLED了）。</p>
<p>（5）不需要高压，直接接3.3V就可以工作了。</p>
<p>【注意】该模块不和5.0V接口兼容，所以请大家在使用的时候一定要小心，不要直接接到5V的系统上去，否则可能烧坏模块。</p>
<h2 id="3-SSD1036"><a href="#3-SSD1036" class="headerlink" title="3. SSD1036"></a><font size=3>3. SSD1036</font></h2><p>我使用的OLED芯片是使用SSD1036这款芯片来驱动的，它是香港<a target="_blank" rel="noopener" href="https://www.solomon-systech.com.cn/zh-hans/">Solomon Systech公司（晶门科技）</a>的一款显示屏驱动芯片，它的相关介绍我们可以在这里看到：<a target="_blank" rel="noopener" href="https://www.solomon-systech.com/zh-hans/product/ssd1306/">SSD1306 - Solomon Systech (International) Limited (solomon-systech.com)</a>，从这个网站是可以下载芯片手册的，但是好像要填一堆信息，可以看本地的：[SSD1306](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)</p>
<p>SSD1306是一款单芯片CMOS OLED&#x2F;PLED驱动器和控制器，用于有机&#x2F;聚合物发光二极管点阵图形显示系统。它由128个段和64个公共端组成（没看懂，反正他可以驱动128*64的OLED屏）。该集成电路是为普通阴极型OLED面板设计的。</p>
<p>SSD1306嵌入了对比度控制、显示RAM和振荡器，减少了外部元件的数量和功耗。它有256级亮度控制。数据&#x2F;命令通过硬件可选的6800&#x2F;8000系列兼容并行接口，I2C接口或串行外设接口从通用MCU发送。它适用于许多小型便携式应用，如手机子显示器、MP3播放器、计算器等。</p>
<h2 id="4-相关资料查阅"><a href="#4-相关资料查阅" class="headerlink" title="4. 相关资料查阅"></a><font size=3>4. 相关资料查阅</font></h2><p>这两个资料都是本地文档，只有在本地的时候点击连接才会打开文档。</p>
<p>OLED屏幕的原理图：<a href="../STM32%E5%BC%80%E5%8F%91%E7%9B%B8%E5%85%B3%E8%B5%84%E6%96%99/02%E6%98%BE%E7%A4%BA%E5%B1%8F%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/OLED%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/02-M00750_VGM128064C0W01_Y01.pdf">M00750_VGM128064C0W01_Y01.pdf</a></p>
<p>SSD1036芯片手册：[SSD1306_datasheet](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)</p>
<h1 id="二、SSD1306"><a href="#二、SSD1306" class="headerlink" title="二、SSD1306"></a><font size=3>二、SSD1306</font></h1><p>接下来我们来看一下SSD1306这款控制器，芯片手册可以看[SSD1306_datasheet](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)</p>
<h2 id="1-功能框图"><a href="#1-功能框图" class="headerlink" title="1. 功能框图"></a><font size=3>1. 功能框图</font></h2><p>功能框图我们可以看[SSD1306_datasheet](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)的4 BLOCK DIAGRAM  一节：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516223810178.png" alt="image-20230516223810178" style="zoom: 50%;" />

<p>关于引脚的详细定义，我们可以查看[SSD1306_datasheet](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)的7 PIN DESCRIPTION  一节，引脚比较多，这里就不说了。</p>
<h2 id="2-BS-2-0"><a href="#2-BS-2-0" class="headerlink" title="2. BS[2:0]  "></a><font size=3>2. BS[2:0]  </font></h2><p>引脚中的BS0、BS1和BS2这里要关注一下，它们三个是芯片与MCU通信接口的选择引脚：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516224253273.png" alt="image-20230516224253273" style="zoom:50%;" />

<p>0就表示接到低电平VSS，1就表示接到高电平VDD。</p>
<h2 id="3-并行8080接口"><a href="#3-并行8080接口" class="headerlink" title="3. 并行8080接口"></a><font size=3>3. 并行8080接口</font></h2><h3 id="3-1-相关引脚说明"><a href="#3-1-相关引脚说明" class="headerlink" title="3.1 相关引脚说明"></a><font size=3>3.1 相关引脚说明</font></h3><p>我们主要是关注一下8080并行接口的读写时序，方便后边LCD的学习。我们先来看一下相关引脚的说明：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516224550687.png" alt="image-20230516224550687" style="zoom:50%;" />

<p>（1）E (RD#)：当选择8080接口模式时，该引脚接收读取(RD#)信号。当该引脚拉低并选择芯片时，开始读取操作。</p>
<p>（2）R&#x2F;W#(WR#) ：这是连接到MCU接口的读写控制输入引脚。当选择8080接口模式时，该引脚将作为写入(WR#)输入。当该引脚被拉低并选择芯片时，开始数据写入操作。</p>
<p>（3）CS#：片选信号，低电平有效。</p>
<p>（4）D&#x2F;C#：这是数据&#x2F;命令控制引脚。当它被拉高(即连接到VDD)，数据在D[7:0]被视为数据。当它被拉低时，D[7:0]的数据将被转移到命令寄存器，也就是被当做命令处理。</p>
<h3 id="3-2-读时序"><a href="#3-2-读时序" class="headerlink" title="3.2 读时序"></a><font size=3>3.2 读时序</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516225917501.png" alt="image-20230516225917501" style="zoom:50%;" />

<p>（1）先根据要读取的数据的类型，设置D&#x2F;C#为高（数据）&#x2F;低（命令）；</p>
<p>（2）然后拉低片选，选中SSD1306；</p>
<p>（3）接着是要读数据，所以要将RD#拉低；</p>
<p>（4）读数据：在RD#的上升沿， 使数据锁存到数据线（D[7：0]）上；</p>
<h3 id="3-3-写时序"><a href="#3-3-写时序" class="headerlink" title="3.3 写时序"></a><font size=3>3.3 写时序</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516225929509.png" alt="image-20230516225929509" style="zoom:50%;" />

<p>（1）先根据要写入的数据的类型，设置D&#x2F;C#为高（数据）&#x2F;低（命令）；</p>
<p>（2）然后拉低片选，选中SSD1306；</p>
<p>（3）接着是要写数据，所以要将WR#拉低；</p>
<p>（4）写数据：在WR#的上升沿， 使数据写入到SSD1306里面；</p>
<h3 id="3-4-同步频率"><a href="#3-4-同步频率" class="headerlink" title="3.4 同步频率"></a><font size=3>3.4 同步频率</font></h3><p>在 8080 方式下读数据操作的时候，我们有时候（例如读显存的时候）需要一个假读命（Dummy Read），以使得微控制器的操作频率和显存的操作频率相匹配。在读取真正的数据之前，由一个的假读的过程。这里的假读，其实就是第一个读到的字节丢弃不要，从第二个开始，才是我们真正要读的数据。</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516230106362.png" alt="image-20230516230106362" style="zoom:50%;" />

<p>可以看到，在发送了列地址之后，开始读数据，第一个是 Dummy Read，也就是假读，我们从第二个开始，才算是真正有效的数据。</p>
<h2 id="4-显存"><a href="#4-显存" class="headerlink" title="4. 显存"></a><font size=3>4. 显存</font></h2><h3 id="4-1-显存的划分格式"><a href="#4-1-显存的划分格式" class="headerlink" title="4.1 显存的划分格式"></a><font size=3>4.1 显存的划分格式</font></h3><p>这一部分我们可以看[SSD1306_datasheet](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)的8.7 Graphic Display Data RAM (GDDRAM)  一节。SSD1306的显存总共为128*64bit大小，SSD1306将这些显存分为了8页。每页包含了128个字节（128*8bit  ），总共8页，这样刚好是128*64的点阵大小。</p>
<table>
<thead>
<tr>
<th align="center">屏幕行列</th>
<th align="center">0~127 列</th>
</tr>
</thead>
<tbody><tr>
<td align="center">0~7 行</td>
<td align="center">PAGE0</td>
</tr>
<tr>
<td align="center">8~15 行</td>
<td align="center">PAGE1</td>
</tr>
<tr>
<td align="center">16~23 行</td>
<td align="center">PAGE2</td>
</tr>
<tr>
<td align="center">24~31 行</td>
<td align="center">PAGE3</td>
</tr>
<tr>
<td align="center">32~39 行</td>
<td align="center">PAGE4</td>
</tr>
<tr>
<td align="center">40~47 行</td>
<td align="center">PAGE5</td>
</tr>
<tr>
<td align="center">48~55 行</td>
<td align="center">PAGE6</td>
</tr>
<tr>
<td align="center">56~63 行</td>
<td align="center">PAGE7</td>
</tr>
</tbody></table>
<p>以 PAGE2 为例， PAGE2 中的显存数据与屏幕像素点的对应关系，如下图所示  ：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516230518574.png" alt="image-20230516230518574" style="zoom:50%;" />

<p>可以看出， 显存中的 1 字节数据对应了屏幕上的 8 个像素， 当往控制器 SSD1306 显存的某一页的某一列写入 1 数据， 那么将会同时修改显存中这一页的这一列对应屏幕上的 8个像素。 如果只想修改屏幕上某一个像素的状态，那么通常可以采用读、修改、写或外部微控制器内建显存的方式，但要注意的是， 在 ATK-MD0096 使用 SPI 或 IIC 通讯接口模式时，是无法读取控制器 SSD1306 的数据的，因此，在此情况下建议使用外部微控制器内建显存的方式，如果是对于 RAM 资源不足的外部微控制器，则建议使用 8 位 6800 或 8 位 8080 通讯接口模式，以减少对 RAM 空间的占用。  </p>
<blockquote>
<p>STM32程序显示数据的原理？</p>
<p>在STM32的内部建立一个 缓存（共128*8个字节），在每次修改的时候，只是修改STM32上的缓存（实际上就是SRAM），在修改完了之后，一次性把STM32上的缓存数据写入到OLED的GRAM。当然这个方法也有坏处，就是对于那些SRAM很小的单片机（比如51系列）就比较麻烦了。</p>
</blockquote>
<h3 id="4-2-与像素的对应关系"><a href="#4-2-与像素的对应关系" class="headerlink" title="4.2 与像素的对应关系"></a><font size=3>4.2 与像素的对应关系</font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">* 显存中的每一比特代表ATK-MD0096模块OLED上的一个像素</span><br><span class="line">*           col0     col1   ...   col127</span><br><span class="line">*       ┌----------------------------------┐</span><br><span class="line">*  row0 | [<span class="number">0</span>][<span class="number">0</span>]<span class="number">.0</span> [<span class="number">0</span>][<span class="number">1</span>]<span class="number">.0</span> ... [<span class="number">0</span>][<span class="number">127</span>]<span class="number">.0</span> |</span><br><span class="line">*  row1 | [<span class="number">0</span>][<span class="number">0</span>]<span class="number">.1</span> [<span class="number">0</span>][<span class="number">1</span>]<span class="number">.1</span> ... [<span class="number">0</span>][<span class="number">127</span>]<span class="number">.1</span> |</span><br><span class="line">*  ...  |   ...      ...    ...     ...    |</span><br><span class="line">*  row7 | [<span class="number">0</span>][<span class="number">0</span>]<span class="number">.7</span> [<span class="number">0</span>][<span class="number">1</span>]<span class="number">.7</span> ... [<span class="number">0</span>][<span class="number">127</span>]<span class="number">.7</span> |</span><br><span class="line">*  row8 | [<span class="number">1</span>][<span class="number">0</span>]<span class="number">.0</span> [<span class="number">1</span>][<span class="number">1</span>]<span class="number">.0</span> ... [<span class="number">1</span>][<span class="number">127</span>]<span class="number">.0</span> |</span><br><span class="line">*  row9 | [<span class="number">1</span>][<span class="number">0</span>]<span class="number">.1</span> [<span class="number">1</span>][<span class="number">1</span>]<span class="number">.1</span> ... [<span class="number">1</span>][<span class="number">127</span>]<span class="number">.1</span> |</span><br><span class="line">*  ...  |   ...      ...    ...     ...    |</span><br><span class="line">* row15 | [<span class="number">1</span>][<span class="number">0</span>]<span class="number">.7</span> [<span class="number">1</span>][<span class="number">1</span>]<span class="number">.7</span> ... [<span class="number">1</span>][<span class="number">127</span>]<span class="number">.7</span> |</span><br><span class="line">*  ...  |              ......              |</span><br><span class="line">* row56 | [<span class="number">7</span>][<span class="number">0</span>]<span class="number">.0</span> [<span class="number">7</span>][<span class="number">1</span>]<span class="number">.0</span> ... [<span class="number">7</span>][<span class="number">127</span>]<span class="number">.0</span> |</span><br><span class="line">* row57 | [<span class="number">7</span>][<span class="number">0</span>]<span class="number">.1</span> [<span class="number">7</span>][<span class="number">1</span>]<span class="number">.1</span> ... [<span class="number">7</span>][<span class="number">127</span>]<span class="number">.1</span> |</span><br><span class="line">*  ...  |   ...      ...    ...     ...    |</span><br><span class="line">* row63 | [<span class="number">7</span>][<span class="number">0</span>]<span class="number">.7</span> [<span class="number">7</span>][<span class="number">1</span>]<span class="number">.7</span> ... [<span class="number">7</span>][<span class="number">127</span>]<span class="number">.7</span> |</span><br><span class="line">*       └----------------------------------┘</span><br></pre></td></tr></table></figure>



<h2 id="5-命令"><a href="#5-命令" class="headerlink" title="5. 命令"></a><font size=3>5. 命令</font></h2><p>SS1306的命令我们可以查看[SSD1306_datasheet](.&#x2F;STM32开发相关资料&#x2F;02显示屏参考资料&#x2F;OLED参考资料&#x2F;01-SSD1306-Revision 1.1 (Charge Pump).pdf)的9 COMMAND TABLE 和 10 COMMAND DESCRIPTIONS  。这里只介绍几个我们用得到的。</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516231115054.png" alt="image-20230516231115054" style="zoom:50%;" />

<p>（1）命令0X81：设置对比度。包含两个字节，第一个0X81为命令，随后发送的一个字节为要设置的对比度的值。这个值设置得越大屏幕就越亮。</p>
<p>（2）命令0XAE&#x2F;0XAF：0XAE为关闭显示命令；0XAF为开启显示命令。</p>
<p>（3）命令0X8D：包含2个字节，第一个为命令字，第二个为设置值，第二个字节的BIT2表示电荷泵的开关状态，该位为1，则开启电荷泵，为0则关闭。在模块初始化的时候，这个必须要开启，否则是看不到屏幕显示的。</p>
<p>（4）命令0XB0~B7：用于设置页地址，其低三位的值对应着GRAM的页地址。</p>
<p>（5）命令0X00~0X0F：用于设置显示时的起始列地址低四位。</p>
<p>（6）命令0X10~0X1F：用于设置显示时的起始列地址高四位。</p>
<h1 id="三、OLED模块"><a href="#三、OLED模块" class="headerlink" title="三、OLED模块"></a><font size=3>三、OLED模块</font></h1><p>这里还是以正点原子的这款OLED模块为例。</p>
<h2 id="1-OLED模块接口方式"><a href="#1-OLED模块接口方式" class="headerlink" title="1. OLED模块接口方式"></a><font size=3>1. OLED模块接口方式</font></h2><table>
<thead>
<tr>
<th>接口方式</th>
<th>4 线 SPI</th>
<th>IIC</th>
<th>8 位 6800</th>
<th>8 位 8080</th>
</tr>
</thead>
<tbody><tr>
<td>BS1</td>
<td>0</td>
<td>1</td>
<td>0</td>
<td>1</td>
</tr>
<tr>
<td>BS2</td>
<td>0</td>
<td>0</td>
<td>1</td>
<td>1</td>
</tr>
</tbody></table>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516221353641.png" alt="image-20230516221353641" style="zoom: 33%;" />

<p>ALIENTEK OLED 模块默认设置是： BS1 和 BS2 接 VCC ，即使用 8080 并口方式，如果想要设置为其他模式，则需要在 OLED 的背面，用烙铁修改 BS1 和 BS2 的设置。  </p>
<h2 id="2-屏幕原理图"><a href="#2-屏幕原理图" class="headerlink" title="2. 屏幕原理图"></a><font size=3>2. 屏幕原理图</font></h2><p>这个的话，我们还是看屏幕厂家给的原理图：<a href="./STM32%E5%BC%80%E5%8F%91%E7%9B%B8%E5%85%B3%E8%B5%84%E6%96%99/02%E6%98%BE%E7%A4%BA%E5%B1%8F%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/OLED%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/02-M00750_VGM128064C0W01_Y01.pdf">M00750_VGM128064C0W01_Y01.pdf</a>,这里只贴一下引脚的定义吧：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516222857198.png" alt="image-20230516222857198" style="zoom: 43%;" />

<p>引脚描述的话我们可以查看<a href="./STM32%E5%BC%80%E5%8F%91%E7%9B%B8%E5%85%B3%E8%B5%84%E6%96%99/02%E6%98%BE%E7%A4%BA%E5%B1%8F%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/OLED%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/02-M00750_VGM128064C0W01_Y01.pdf">M00750_VGM128064C0W01_Y01.pdf</a>的5 Module Interface一节，这里就不详细说明了。</p>
<h2 id="3-与SSD1036接线？"><a href="#3-与SSD1036接线？" class="headerlink" title="3. 与SSD1036接线？"></a><font size=3>3. 与SSD1036接线？</font></h2><p>在屏幕厂家给的原理图<a href="./STM32%E5%BC%80%E5%8F%91%E7%9B%B8%E5%85%B3%E8%B5%84%E6%96%99/02%E6%98%BE%E7%A4%BA%E5%B1%8F%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/OLED%E5%8F%82%E8%80%83%E8%B5%84%E6%96%99/02-M00750_VGM128064C0W01_Y01.pdf">M00750_VGM128064C0W01_Y01.pdf</a>的6 Function Block Diagram一节还给出了OLED屏幕与SSD1036控制器的接线图：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-25-OLED-01-OLED%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/img/image-20230516223534378.png" alt="image-20230516223534378" style="zoom:50%;" />


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